Backlight module and LCD comprising the same

Abstract

A backlight module comprises a backplate having a baseplate and side plates, a direct-lit LED array, edge-lit LED arrays and a light guide panel. The light guide panel is located above the baseplate. The direct-lit LED array is disposed between the baseplate and the light guide panel. The edge-lit LED arrays are disposed at two sides of the light guide panel and facing light incident surfaces thereof respectively. Light scattering structures for scattering light rays are disposed on a light exiting surface or on a bottom surface of the light guide panels. With the LED arrays and the light scattering structures, the light guide panel is divided into three backlight regions. Displaying of the backlight module is controlled region by region by the light scattering structures and the LED drive circuit to improve the brightness of the backlight module and reduce the power consumption of the liquid crystal module.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This is a continuation of non-provisional application No. 13 / 376,837, filed on Dec. 7, 2011 and entitled “BACKLIGHT MODULE AND LCD COMPRISING THE SAME”.BACKGROUND[0002]1. Technical Field[0003]The present disclosure relates to the technical field of liquid crystal 5 displaying, and more particularly, to a backlight module and a liquid crystal display (LCD) comprising the same.[0004]2. Description of Related Art[0005]LCDs currently available all comprise a liquid crystal module and a backlight module adapted to provide backlight for a liquid crystal panel of the liquid crystal module. Because the liquid crystal panel does not emit light by itself, the backlight module must provide a uniform light source having adequate brightness to the liquid crystal panel so that the liquid crystal panel operates to display an image normally.[0006]However, conventional liquid crystal modules using backlight have an invariable power consumption during oper...

AI Technical Summary

Benefits of technology

[0008]The primary objective of the present disclosure is to provide a backlight module and a liquid crystal display (LCD) comprising the same, which are intended to reduce the power consumption of the liquid crystal module and improve the effect of adjusting the backlight region by region.

[0022]According to the backlight module and the LCD comprising the same of the present disclosure, the direct-lit design and the edge-lit design are used in combination in the backlight module, and a number of light scattering structures for scattering light rays are disposed on the light exiting surface or the bottom surface of the light guide panel at both ends of the light guide panel to divide the light guide panel into three backlight regions. By using the light scattering structures to disrupt the total reflection of light rays inside the light guide panel, regions illuminated by the backlight from the edge-lit LED arrays are controlled by the light scattering structures on the light guide panel while a region illuminated by the backlight from the direct-lit LED array is controlled by the LED drive circuit. In this way, the effect of adjusting the brightness of the backlight of the backlight module region by region is improved and the power consumption of the liquid crystal module is reduced.

Problems solved by technology

However, conventional liquid crystal modules using backlight have an invariable power consumption during operation; that is, brightness of the backlight cannot be adjusted according to brightness of an image to be displayed by the liquid crystal module.

In other words, the brightness of the backlight cannot be adjusted region by region, and this is unfavorable for energy saving.

However, this way of splicing light guide panels together causes problems of nonuniform brightness and chromaticity at splicing gaps.

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